/* eslint-disable */
require('script-loader!file-saver');
require('./blob');
// require('script-loader!xlsx/dist/xlsx.core.min');

function generateArray(table) {
    var out = [];
    var rows = table.querySelectorAll('tr');
    var ranges = [];
    for (var R = 0; R < rows.length; ++R) {
        var outRow = [];
        var row = rows[R];
        var columns = row.querySelectorAll('td');
        for (var C = 0; C < columns.length; ++C) {
            var cell = columns[C];
            var colspan = cell.getAttribute('colspan');
            var rowspan = cell.getAttribute('rowspan');
            var cellValue = cell.innerText;
            if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

            //Skip ranges
            ranges.forEach(function (range) {
                if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
                    for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
                }
            });

            //Handle Row Span
            if (rowspan || colspan) {
                rowspan = rowspan || 1;
                colspan = colspan || 1;
                ranges.push({s: {r: R, c: outRow.length}, e: {r: R + rowspan - 1, c: outRow.length + colspan - 1}});
            }
            ;

            //Handle Value
            outRow.push(cellValue !== "" ? cellValue : null);

            //Handle Colspan
            if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
        }
        out.push(outRow);
    }
    return [out, ranges];
};

function datenum(v, date1904) {
    if (date1904) v += 1462;
    var epoch = Date.parse(v);
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function getTextWidth(text, font) {
    // re-use canvas object for better performance
    var canvas = getTextWidth.canvas || (getTextWidth.canvas = document.createElement("canvas"));
    var context = canvas.getContext("2d");
    context.font = font;
    var metrics = context.measureText(text);
    return metrics.width;
}


function sheet_from_array_of_arrays(data, opts) {
    var ws = {};
    var range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}};
    var colWidth = [];
    const borderAll = {  //单元格外侧框线
        top: {
            style: 'thin'
        },
        bottom: {
            style: 'thin'
        },
        left: {
            style: 'thin'
        },
        right: {
            style: 'thin'
        }
    };

    for (var R = 0; R != data.length; ++R) {
        for (var C = 0; C != data[R].length; ++C) {

            var w = data[R][C] ? getTextWidth(data[R][C],"14px 宋体") + 10 : 120;
            if(w>400){
                w = 400;
            }
            if(C > colWidth.length -1){
                colWidth.push({wpx: 120});
            }else {
                if (w > colWidth[C].wpx) {
                    colWidth[C] = {wpx: w};
                }
            }
            if (range.s.r > R) range.s.r = R;
            if (range.s.c > C) range.s.c = C;
            if (range.e.r < R) range.e.r = R;
            if (range.e.c < C) range.e.c = C;
            var cell = {v: data[R][C]};
            if (cell.v == null || cell.v == undefined) {
                cell.v = '';
            }
            var cell_ref = XLSX.utils.encode_cell({c: C, r: R});

            if (typeof cell.v === 'number') cell.t = 'n';
            else if (typeof cell.v === 'boolean') cell.t = 'b';
            else if (cell.v instanceof Date) {
                cell.t = 'n';
                cell.z = XLSX.SSF._table[14];
                cell.v = datenum(cell.v,true);
            }
            else cell.t = 's';
            if(R ==0){
                cell.s = {
                    font: {
                        name: '宋体',
                        sz: 14,
                        color: {rgb: "000000"},
                        bold: true,
                        italic: false,
                        underline: false
                    },
                    alignment: {
                        horizontal: "center",
                        vertical: "center"
                    },
                    fill: {
                        fgColor: {rgb: "e0e0e0"},
                    },
                    border: borderAll
                };
            }else{
                cell.s = {
                    font: {
                        name: '宋体',
                        sz: 12,
                        color: {rgb: "000000"},
                        bold: false,
                        italic: false,
                        underline: false
                    },
                    border: borderAll
                };
            }
            ws[cell_ref] = cell;
        }
    }

    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
    ws["!cols"] = colWidth;
    return ws;
}

function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook();
    this.SheetNames = [];
    this.Sheets = {};
}

function s2ab(s) {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
}

export function export_table_to_excel(id) {
    var theTable = document.getElementById(id);
    console.log('a')
    var oo = generateArray(theTable);
    var ranges = oo[1];

    /* original data */
    var data = oo[0];
    var ws_name = "Sheet1";
    console.log(data);

    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);

    /* add ranges to worksheet */
    // ws['!cols'] = ['apple', 'banan'];
    ws['!merges'] = ranges;
    ws["B1"].s = { font: { sz: 14, bold: true, color: { rgb: "FFFFAA00" } }, fill: { bgColor: { indexed: 64 }, fgColor: { rgb: "FFFF00" } }};
        /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: true, type: 'binary',cellStyles: true});

    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), "test.xlsx")
}

function formatJson(jsonData) {
    console.log(jsonData)
}
export function export_json_to_excel(th, jsonData, defaultTitle) {

    /* original data */

    var data = jsonData;
    data.unshift(th);
    var ws_name = "Sheet1";

    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);

    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
    var title = defaultTitle || '列表'
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}